Yes it is
Mountain is to valley as mound is to ditch
A certainly hazier answer than one may at first think. There are registered "mountains" in Mississipi (I forget the names...) that are less than 900 ft...and Charles MOund is at 1,235 feet, with many other hills in the general Driftless area of similar height. I would think some categorizations of "mounains" and "hills" must take other aspects in mind... By most definitions, Charles Mound is categorized simply as a "high hill". What is stopping it by being considered a genuine mountain by most? Not sure.
No mountain ranges exist in Illinois. The highest point in Illinois is Charles Mound in JoDavies county which stands 1,235 feet high.
In Illinois
Sir Charles and The Round Mound of Rebound.
The tallest Mountain in Illiniois is not a Mountain, it does not even qualify as a hill or prominence. it might even be called something short of a mound. Wheat fields in Colorado are at three times the altitude and elevation. The tallest 'mountain' in Illinois is Charles Mound at 374 m or 1,227 ft. Latitude/Longitude 42.504 / -90.24
375
Charles mounds
It is Charles Mound at 1,235 feet above sea level.
A hill is a mound of raised land that is smaller than a mountain. It is generally lower in height and less steep in slope compared to a mountain.
Charles Mound is the highest point in Illinois.
mt. vesuvius (mt.=mountain ('mount', not mound)) is located near Naples, Italy